Marc installed a window AC unit effectively, but could have been better about taking his time to plan out his work. For example, he drilled in a few new holes prior to noticing old ones that may have been reused, and while his new placement location may have been better (which he stated afterwards), it would have been better had he explained and asked prior to drilling the new holes. Also, he used a power screwdriver and screwed in a couple of screws crooked in a tight space which he later corrected with a manual screwdriver. Lastly, Marc neglected to follow up to confirm a time the night prior to the job, but did return my call that morning and arrived promptly. I would be hesitant about hiring Marc for detailed jobs, but for general, simple tasks, he is probably proficient.